<template>
    <div>
        <!-- 面包屑导航 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>
      <!-- 卡片视图 -->
      <el-card>
          <!-- 提示区 -->
           <el-alert title="添加商品" type="info" center show-icon :closable="false"></el-alert>
           <!-- 步骤条区 -->
           <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
             <el-step title="基本信息"></el-step>
             <el-step title="商品参数"></el-step>
             <el-step title="商品属性"></el-step>
             <el-step title="商品图片"></el-step>
             <el-step title="商品内容"></el-step>
             <el-step title="完成"></el-step>
           </el-steps>
           <!-- tab栏区 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
          <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name="0">
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
              </el-form-item>
               <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
              </el-form-item>
               <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
              </el-form-item>
               <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" 
                v-model="addForm.goods_cat" @change="handleChange"></el-cascader>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
              <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                <el-checkbox-group v-model="item.attr_vals">
                  <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                </el-checkbox-group>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
              <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                <el-input v-model="item.attr_vals"></el-input>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图品" name="3">
              <!-- action表示图片要上传的API地址 -->
              <el-upload :action="uploadURL" :on-preview="handlePreview"
              :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
              <!-- 富文本编辑器 -->
              <quill-editor v-model="addForm.goods_introduce"></quill-editor>
              <!-- 添加商品的按钮 -->
              <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
            </el-tab-pane>
             </el-tabs>
         </el-form>
     </el-card>
      <!-- 图片预览 -->
      <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
         <img :src="previewPath" alt="" class="previewImg">
      </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'
export default {
    data(){
        return {
          activeIndex: '0',
          //添加表单数据的对象
          addForm: {
            goods_name: '',
            goods_price: 0,
            goods_weight: 0,
            goods_number: 0,
            //商品所属的分类数据
            goods_cat: [],
            //图片数组
            pics: [],
            //商品详情描述
            goods_introduce: '',
            //存储动态参数和静态属性
            attrs: []
          },
          //添加表单校验规则
          addFormRules: {
            goods_name: [
              {required:true,message: '请输入商品名称', trigger: 'blur'}
            ],
            goods_price: [
              {required: true,message: '请输入商品价格', trigger: 'blur'}
            ],
            goods_weight: [
              {required: true,message: '请输入商品重量', trigger: 'blur'}
            ],
            goods_number: [
              {required: true,message: '请输入商品数量', trigger: 'blur'}
            ],
            goods_cat: [
              {required: true,message: '请选择商品分类', trigger: 'blur'}
            ],
          },
          // 商品分类数据
          catelist: [],
          cateProps: {
            label: 'cat_name',
            value: 'cat_id',
            children: 'children'
          },
          //动态参数列表数据
          manyTableData: [],
          //静态属性列表数据
          onlyTableData: [],
          //图片上传地址
          uploadURL: "https://www.liulongbin.top:8888/api/private/v1/upload",
          //图片上传组件的header请求头
          headerObj: {
            Authorization: window.sessionStorage.getItem('token')
          },
          // 图片预览的绝对路径
          previewPath: '',
          // 控制图片预览对话框的显示与隐藏
          previewVisible: false
        }
    },
    created(){
      this.getCateList()
    },
    methods: {
      //获取所有商品分类数据
      async getCateList(){
        const {data:res} = await this.$http.get(`categories`)
        if(res.meta.status !== 200){
          return this.$message.error('获取商品分类失败')
        }
        this.catelist = res.data
      },
      //级联选择器选项发生变化时触发的函数
      handleChange(){
        if(this.addForm.goods_cat.length !== 3){
          this.addForm.goods_cat = []
        }
      },
      //tab栏切换事件
      beforeTabLeave(activeName,oldActiveName){
        if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
          this.$message.error('请先选择商品分类')
          return false
        }
      },
      async tabClicked(){
        //为1说明访问的是商品参数标签
        if(this.activeIndex === '1'){
          const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params: {sel:'many'}})
          if(res.meta.status !== 200){
            return this.$message.error('获取动态参数列表失败')
          }
          res.data.forEach(item => {
            item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
          })
          this.manyTableData = res.data
        }else if(this.activeIndex === '2'){
           const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params: {sel:'only'}})
          if(res.meta.status !== 200){
            return this.$message.error('获取静态属性列表失败')
          }
          res.data.forEach(item => {
            item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
          })
          this.onlyTableData = res.data
        }
      },
      //监听图片上传成功的事件
      handleSuccess(response){
        //拼接得到一个图片信息对象，然后将该对象push到pics数组中去
        const picInfo = {pic: response.data.tmp_path}
        this.addForm.pics.push(picInfo)

      },
      //点击图片的文字预览图片
      handlePreview(file){
        this.previewPath = file.response.data.url
        this.previewVisible = true
      },
      //点击图片的关闭按钮，移除图片
      handleRemove(file){
        //获取将要删除的图片的临时路径
       const filePath = file.response.data.tmp_path
        //从pics数组中，找到这个图片对应的索引值
        const i = this.addForm.pics.findIndex(x => x.pic === filePath)
        //调用splice方法，把图片对象从pics中移除
        this.addForm.pics.splice(i,1)
      },
      //商品所有信息填写完后，添加商品
      add(){
       this.$refs.addFormRef.validate(async valid => {
         if(!valid){
          return this.$message.error('请填写必要的表单项')
         }
         //将this.addForm深拷贝一份，防止出现级联选择器要求goods_cat是数组,而添加请求中要求是字符串的矛盾
         const form =  _.cloneDeep(this.addForm)
         form.goods_cat = form.goods_cat.join(',')
         //处理动态参数，这里的attr_vals是一个数组，需要转化为字符串
         this.manyTableData.forEach(item =>{
           const newInfo = {attr_id: item.attr_id,attr_value: item.attr_vals.join(' ')}
           this.addForm.attrs.push(newInfo)
         })
         //处理静态属性,这里的attr_vals本来就是一个字符串
         this.onlyTableData.forEach(item =>{
           const newInfo = {attr_id: item.attr_id,attr_value: item.attr_vals}
           this.addForm.attrs.push(newInfo)
         })
         form.attrs = this.addForm.attrs
         console.log(form.attrs);
         console.log(form);
         console.log(typeof form.goods_number)
         //发起请求添加商品
         const {data: res} = await this.$http.post('goods',form)
         if(res.meta.status !== 201){
          console.log(res.meta.status);
          return this.$message.error('添加商品失败！')
         }
         this.$message.success('添加商品成功！')
         this.$router.push('/goods')
       })
      }

    },
    computed: {
        cateId(){
          if(this.addForm.goods_cat.length === 3){
            return this.addForm.goods_cat[2]   //返回三级分类的id
          }
          return null
        }
    }
}
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 0 5px 0 0 !important
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>